Atmospheric vertical velocity - a crucial component in understanding proximal deposition of volcanic ash
Atmospheric vertical velocity - a crucial component in understanding proximal deposition of volcanic ash
复制标题
大气垂直速度 - 了解火山灰近端沉积的关键组成部分
DOI:
10.1016/j.epsl.2021.116980
复制
发表时间:
2021
影响因子:
5.3
通讯作者:
and M. Iguchi
中科院分区:
文献类型:
--
作者:
Poulidis;A.-P.;S. Biass;G. Bagheri;T. Takemi;and M. Iguchi
The simulation of volcanic ash transport and deposition (VATD) for distances within a few kilometres from the vent (proximal region) is challenging owing to a combination of unresolved volcanogenic effects and the impact of the volcano's orography. Due to the urgency of calculations or sometimes lack of access to computational resources or expertise, atmospheric vertical velocity (w) is often underestimated in VATD modelling. The error associated with this underestimation has, however, never been properly quantified. Here, we use a weak vulcanian eruption that occurred at Sakurajima volcano on 1/10/2017 as a first step to addressing this limitation. We combine deposit characteristics observed by disdrometer measurements with high-resolution atmospheric and VATD modelling to validate and illustrate the differences in modelled trajectories whenwis either ignored or accounted for. The Weather Research and Forecasting (WRF) model is used to model the orogenic effects down to a resolution of 50 m. Eulerian and Lagrangian VATD models (FALL3D and LagTrack, a newly-developed Matlab code, respectively) are used to describe the particle trajectories. Results confirm the importance ofwin the case of low-altitude eruptions for capturing the complex, near-vent trajectory of ash particles: when neglected fall velocities were seen to differ up to 2–5 m s−1depending on the particle size. Although the impact ofwis most notable within 10 km from the vent, the forced sedimentation of low terminal velocity particles can have a significant secondary effect at larger distances.
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DOI:
10.1007/978-94-007-4098-3_5
发表时间:
2013
期刊:
--
影响因子:
--
作者:
D. Steyn;S. Wekker;M. Kossmann;A. Martilli
通讯作者:
D. Steyn;S. Wekker;M. Kossmann;A. Martilli
影响因子:
3.9
作者:
Costa, Antonio;Folch, Arnau;Macedonio, Giovanni
通讯作者:
Macedonio, Giovanni
DOI:
10.1016/b978-0-08-100405-0.00005-7
发表时间:
2016-01-01
期刊:
VOLCANIC ASH: HAZARD OBSERVATION
影响因子:
--
作者:
Bagheri, G.;Bonadonna, C.
通讯作者:
Bonadonna, C.
DOI:
--
发表时间:
2017
期刊:
影响因子:
--
作者:
A. Poulidis;T. Takemi;M. Iguchi;I. Renfrew
通讯作者:
I. Renfrew
DOI:
--
发表时间:
2017
期刊:
影响因子:
--
作者:
A. Marti;A. Folch
通讯作者:
A. Folch